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Low Computational Complexity DirectionofArrival Estimation of Wideband Signal Sources Based on Squared TOPS
Hirotaka HAYASHI Tomoaki OHTSUKI
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E100A
No.1
pp.219226 Publication Date: 2017/01/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E100.A.219 Type of Manuscript: Special Section PAPER (Special Section on Wideband Systems) Category: Keyword: array signal processing, DOA estimation, wideband signals,
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Summary:
We propose a new directionofarrival (DOA) estimation method of wideband signals. In several decades, many approaches to estimate DOA of wideband signal sources have been proposed. Test of orthogonality of projected subspaces (TOPS) and Squared TOPS are the estimation algorithms to realize high resolution performance of closely spaced signal sources. These methods, however, are not suitable for DOA estimation of multiple signal sources, because the spatial spectrum calculated by Squared TOPS has some false peaks. Therefore, the authors have proposed the weighted squared TOPS (WSTOPS) to suppress these false peaks by modifying the orthogonality evaluation matrix, WSTOPS also achieves better DOA estimation accuracy than that of Squared TOPS. On the other hand, WSTOPS has a drawback, it requires high computational complexity. Our new method can realize good DOA estimation performance, which is better than that of Squared TOPS, with low computational complexity by reducing the size of orthogonality evaluation matrix and the number of subspaces to be used. Simulation results show that the new method can provide high resolution performance and high DOA estimation accuracy with low computational complexity.

